Debt Obligations (Details) (USD $)	3 Months Ended	6 Months Ended
	Jul. 28, 2012	Jul. 28, 2012	Jan. 28, 2012
Debt Instrument [Line Items]
Total debt obligations	$ 47,406,000	$ 47,406,000	$ 49,503,000
Less: Current portion of debt obligations	710,000	710,000	13,782,000
Long-term debt obligations	46,696,000	46,696,000	35,721,000
Revolving credit facility, maximum borrowing capacity	250,000,000	250,000,000
Revolving credit facility, expiration date		Jun. 30, 2016
Aggregate amount of revolving credit facility with accordion feature	350,000,000	350,000,000
Revolving credit facility, weighted average interest rate during period	2.00%	2.00%
Revolving credit facility, average daily borrowings		27,300,000
Letters of credit outstanding	5,400,000	5,400,000
Revolving credit facility, excess borrowing availability	203,800,000	203,800,000
Interest rate, minimum (in hundredths)	4.60%
Interest rate, maximum (in hundredths)	6.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt obligations	40,730,000	40,730,000	24,500,000
Equipment Financing Notes [Member]
Debt Instrument [Line Items]
Total debt obligations	0	0	17,996,000
Equipment financing repayment	14,000,000
Prepayment penalty fees	100,000
Finance lease obligations [Member]
Debt Instrument [Line Items]
Total debt obligations	$ 6,676,000	$ 6,676,000	$ 7,007,000